Form the strongest duo and fight in this thrilling and unrelenting versus action game! This is a complete port of the collaboration with Twilight Frontier, from the Touhou Project by Team Shanghai Alice.

A mysterious phenomenon called “”Perfect Possession”” is occurring.
A phenomenon where one is possessed by a completely different person not only in mind but in body.
However there is nothing to worry about, as Reimu has already figured out the cause of this phenomenon.

“The strongest duo has been formed.”
“Maybe something bad will happen for humans.”
“Has an enemy that cannot be defeated alone appeared?”
Terrified, the people of the village made these foolish rumors.

Unfounded rumors have begun to materialize, due to an unresolved incident called the “Urban Legend Incidents.”
It is clear that the “Perfect Possession” this time around is one of these “Urban Legend Incidents.”

This is a story of those observing “Perfect Possession,” those exploiting it, those involved for no reason, and those trying to expose the threat hiding in the shadows…….
What begins now is the bittersweet tale of those who mistook themselves for the strongest duo.

This time, the incidents are one where two become one?! ”Touhou Hyouibana　～ Antinomy of Common Flowers.” is a versus action game where you take control of the residents of “Gensokyo”, a place where people and youkai live together, and follow the story about the recurring incidents to its resolution.